Abstract
Abstract The daily concentration of airborne pollen has been recorded in central Stockholm during the period 1 March-31 August, 1977–1986, using a Burkard seven-day recording volumetric spore trap placed c. 20 m above ground level. Total annual catches and phenology of arboreal pollen are presented, attaching importance to five frequent deciduous taxa namely Corylus, Alnus, Ulmus, Betula and Quercus. The annual arboreal pollen count is numerically presented in a bar diagram together with non-arboreal, unidentified and estimated missing data. The arboreal count dominates and has varied from 10513 in 1986 to 39552 in 1985. The non-arboreal pollen contribution to the annual sum has varied from 10 to 30% and does not correlate to the rise and fall of the arboreal sum. Annual pollen sums in Betula and Ulmus show a certain tendency towards a two-year cycle while Pinus shows a tendency towards a three-year cycle. The phenology is presented on a decadal (10-day) mean basis and shown as a percentage of the yearly ...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
